Address web bundle e2e test flakiness.
Address web bundle e2e test flakiness.

To do that, wait for (the effect of) web bundle events, i.e. expect test
before doing any checks. The network log view might not show web bundle
specific data until web bundle events are received.

Bug: 1182537
Change-Id: I0e8eefb7bb6c9664da3d70a34f18306090bc84e3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2963820
Reviewed-by: Wolfgang Beyer <573aa99bb19da47d816981118f95c945310dd3f4@chromium.org>
Commit-Queue: Wolfgang Beyer <573aa99bb19da47d816981118f95c945310dd3f4@chromium.org>
Auto-Submit: Danil Somsikov <f16a5ee11618cab93684e694f9aa762d34f02920@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend